> For the complete documentation index, see [llms.txt](https://docs.fusion.vectra.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fusion.vectra.ai/detection-models/library/denial-of-service/dnsattack.md).

# dnsattack

**Explanation**

The dnsattack security event in the Netography Fusion Portal is designed to detect DNS flood attacks in your network. DNS flood happens when an attacker floods a DNS server with queries, making it unresponsive to legitimate requests. This can cause network downtime and service disruptions.

**What to Look For**

To examine the results of the dnsattack event, look for excessive DNS traffic in your network. The Netography Fusion Portal will alert you to the source and destination IP addresses involved in the attack. Look for patterns of repeated queries and unusual spikes in DNS traffic volume. Check your DNS server logs for signs of a flood attack, such as an excessive number of queries from a single IP address. Take action to block the attacker's IP address or configure your network to limit the amount of DNS traffic allowed from a single source IP address.

**Related MITRE ATT\&CK Categories**

[Impact: Network Denial of Service, Technique T1498 - Enterprise](https://attack.mitre.org/techniques/T1498)


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